6. Substitute the letter "f" for the letter'n" and the letter “k” for the letter "b." Break the string of altered letters into groups of three and write the resulting sentence.

any school based questions?

i would say the answer is b. zigzag lines of the leaves. i believe this is the answer because zigzag lines go in different direction while the other options like: the vertical lines of the trees, the dotted lines on the road, and the curved lines of the park benches go in one direction.